1. Save the attachment to a folder on your harddisk.
2. Run the Powerpoint viewer (2003 version)
3. Do File>Open and browse to the file.
Does this work? I had some issues with the Powerpoint viewer 2007 indeed. But that's only needed for ppsx and pptx extension, and that's not what you're talking about.
Installed PowerPointViewer but I still get " no program associated with this file" message. I am not sure that the viewer is set up properly with the free download. Thanks for your help.